JP3639944B2 - Telescopic device for bridge - Google Patents

Telescopic device for bridge Download PDF

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Publication number
JP3639944B2
JP3639944B2 JP31009698A JP31009698A JP3639944B2 JP 3639944 B2 JP3639944 B2 JP 3639944B2 JP 31009698 A JP31009698 A JP 31009698A JP 31009698 A JP31009698 A JP 31009698A JP 3639944 B2 JP3639944 B2 JP 3639944B2
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JP
Japan
Prior art keywords
bridge
expansion
finger
broken
contraction device
Prior art date
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Expired - Fee Related
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JP31009698A
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Japanese (ja)
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JP2000136505A (en
Inventor
俊成 小田
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Nitta Corp
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Nitta Corp
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Description

【0001】
【発明の属する技術分野】
この発明は橋梁用伸縮装置に関するものである。
【0002】
【従来の技術】
従来より、橋梁用伸縮装置が知られている。
【0003】
図10乃至図12に示すように、この橋梁用伸縮装置31は、対向する櫛形のフィンガー部32が橋桁33や橋台などの遊間34をはさんで相互に噛み合わさるように配設され、走行車両の輪荷重を支持する。この橋梁用伸縮装置31は、温度変化等による橋桁33の橋軸(走路)方向Xの伸縮を吸収できるという利点を有する。
【0004】
しかし、車両走行の安全上の見地から橋軸直角(横断)方向Yの隙間はタイヤが嵌まり込み好ましくなくこの方向にはあまり大きな隙間は取れないので、橋軸直角(横断)方向Yの相対変位は殆ど許容できないという問題があった。
【0005】
よって、地震などにより橋梁に遊間をはさんで橋軸直角(横断)方向Yに大きな相対変位が生じてもこの方向の相対変位は吸収できず、揺れながら震動を吸収する免震設計の橋梁の場合でも折角の免震機能が発揮できないので、橋梁の破壊や倒壊を招くおそれがあった。
【0006】
【発明が解決しようとする課題】
そこでこの発明は、地震などによる橋軸直角方向の大きな相対変位を許容できる橋梁用伸縮装置を提供しようとするものである。
【0007】
【課題を解決するための手段】
前記課題を解決するためこの発明では次のような技術的手段を講じている。
▲1▼ この発明の橋梁用伸縮装置は、櫛形のフィンガー部が遊間をはさんで対向して配設され、走行車両の輪荷重を支持し、温度変化等による橋軸方向の伸縮を吸収する橋梁用伸縮装置であって、前記対向するフィンガー部は地震等で橋軸直角方向の相対変位が生じて所定値以上の力がかかると破壊するように設定されたことを特徴とする。
【0008】
この橋梁用伸縮装置は、対向するフィンガー部は地震等で橋軸直角方向の相対変位が生じて所定値以上の力がかかると破壊するように設定されたので、通常時には橋軸直角方向の相対変位に際し所定値未満の力がかかってもフィンガー部は破壊せず、これにより相対変位を拘束して車両の円滑な走行を担保することができる。
【0009】
一方、地震などにより橋梁に遊間をはさんで橋軸直角方向に大きな相対変位が生じて所定値以上の力がかかると、フィンガー部が破壊して相対変位が可能となる。なお、例えば揺れながら震動を吸収する免震設計の橋梁では免震機能が発揮され、橋梁の破壊や倒壊を防止することができる。
▲2▼ 前記対向する櫛形のフィンガー部の少なくとも一方側が所定値以上の力がかかると破壊するように設定してもよい。
▲3▼ 前記櫛形のフィンガー部に切欠を形成してもよい。このように構成すると、櫛形のフィンガー部の切欠の度合いにより破壊する際の値を設定することができる。なお前記切欠として例えばフィンガー部の外方からの切込みや、フィンガー部の内方のスリットなどを形成することができる。切込みの場合には、その深さにより破壊する際の値を設定することができる。
▲4▼ 前記フィンガー部が棒状接続部材により連結されているようにしてもよい。前記棒状接続部材として、例えばピンやボルトなどを用いることができる。このように構成すると、フィンガー部を連結するピンやボルトの数や太さにより破壊する際の値を設定することができる。
▲5▼ 前記フィンガー部が橋軸直角方向の相対変位に際して破壊しやすい形状又は/及び材質の連結部材により連結されていることとしてもよい。
▲6▼ 前記連結部材はフィンガー部に対して複数個が直列に連結されていることとしてもよい。このように構成すると、直列の連結部材の数により破壊する際の値を設定することができる。
▲7▼ 前記フィンガー部の下側に破壊したフィンガー部の落下防止部材が配設されたこととしてもよい。このように構成すると非常時にフィンガー部が破壊して断裂した場合、その下側の落下防止部材により地上までは落下しない。なお、前記フィンガー部は所定値以上の力がかかると橋軸直角方向に破壊はするが、走行車両の鉛直荷重には耐えて断裂せずに連結しているようにすることもできる。
▲8▼ フィンガー部の落下防止部材は走行車両の鉛直荷重に耐えられるようにしてもよい。このように構成すると非常時発生後にフィンガー部が破損していても、走行車両の鉛直荷重に耐えられる落下防止部材の存在により、少なくとも(緊急)車両が通過することはできる。
【0010】
【発明の実施の形態】
以下、この発明の実施の形態を図面を参照して説明する。
(実施形態1)
図1乃至図3に示すように、この実施形態の橋梁用伸縮装置は、櫛形のフィンガー部1が橋桁2や橋台などの遊間3をはさんで対向して配設され、走行車両の輪荷重を支持し、温度変化等による橋軸(走路)方向Xの伸縮を吸収する。具体的には図3に示すように、免震装置4を介して橋脚5により支持された橋桁2相互間の遊間3に配設している。
【0011】
前記対向するフィンガー部1は、地震等で橋軸直角方向の相対変位が生じて所定値以上の力がかかると破壊するように設定している。すなわち、鋼製とした対向するフィンガー部1の一方側は、橋軸直角(横断)方向Yの相対変位に際して破壊可能としている。対向する櫛形のフィンガー部1の一方側の根本近傍に、橋軸直角(横断)方向Yに折れ易くするように両側から切込み6を形成している。なおこの実施形態ではフィンガー部1の根本近傍に切込み6を形成したが、破壊可能な箇所はフィンガー部1の根本近傍でなく中央部近傍その他の箇所でもよい。
【0012】
そして、これによって橋軸直角(横断)方向Yの相対変位に際してフィンガー部1が破壊して折れることが可能とし、橋軸直角(横断)方向Yの相対変位を吸収するようにしている。なおフィンガー部1の周囲に、衝撃緩和用の薄いゴム層(図示せず)を形成しておいてもよい。
【0013】
また前記フィンガー部1の下側には破壊したフィンガー部1の落下防止部材7を配設しており、この落下防止部材7は荷重支持機能も有する。フィンガー部1の落下防止部材7は走行車両の鉛直荷重に耐えられるようにしている。
【0014】
次に、この実施形態の橋梁用伸縮装置の使用状態を説明する。
この橋梁用伸縮装置は、対向するフィンガー部1は地震等で橋軸直角方向の相対変位が生じて所定値以上の力がかかると破壊するように設定されたので、通常時には橋軸直角方向の相対変位に際し所定値未満の力がかかってもフィンガー部1は破壊せず、これにより相対変位を拘束して車両の円滑な走行を担保することができる。
【0015】
一方、地震などにより橋梁に遊間3をはさんで橋軸直角(横断)方向Yに大きな相対変位が生じて所定値以上の力がかかると、フィンガー部1の切込み6部分が破壊して相対変位が可能となり、地震などによる橋軸直角方向の大きな相対変位を許容できる。従って免震装置4を備え、揺れながら震動を吸収する免震設計の橋梁では免震機能が発揮され、橋梁の破壊や倒壊を防止することができる。
【0016】
換言すると、この橋梁用伸縮装置は、設定値以上の力がかかると破壊し易い箇所を意図的に形成しており、フィンガー部を選択的に破壊するようにして壊して相対変位に対応する。一方、通常時は壊れたら困るので、想定した以上の地震等の非常時以外にはフィンガー部は破壊せず、相対変位を有効に拘束することができる。
【0017】
また、櫛形のフィンガー部1の根本近傍の切込み6により破壊可能であるようにしており、単純な構造として実施することができる。切込み6の深さにより破壊する際の値を設定することができる。さらに破壊させる所を限定することにより、修理する際には切込み6が入ったフィンガー・プレートを用意して交換すればよく、補修がし易い。
【0018】
前記フィンガー部1の下側に破壊したフィンガー部の落下防止部材7を配設しており、非常時にフィンガー部1が破壊して断裂した場合、その下側の落下防止部材7により地上までは落下しない。
【0019】
フィンガー部の落下防止部材7は走行車両の鉛直荷重に耐えられるようにしており、非常時発生後にフィンガー部1が破損していても、少なくとも(緊急)車両が通過することはでき、救助活動の障害とはならない。
【0020】
なお、前記フィンガー部1は所定値以上の力がかかると橋軸直角方向に破壊はするが、走行車両の鉛直荷重には耐えて断裂せずに連結しているように形成してもよい。
(実施形態2)
次に、実施形態2を実施形態1との相違点を中心に説明する。
【0021】
実施形態1では対向する櫛形のフィンガー部1の一方側が所定値以上の力がかかると破壊するように設定したのに対し、図4に示すように、対向する櫛形のフィンガー部1の両側が所定値以上の力がかかると破壊するように設定した。したがって、地震等に起因する橋軸直角(横断)方向Yの相対変位に対してより円滑に対処することができる。
(実施形態3)
次に、実施形態3を実施形態1との相違点を中心に説明する。
【0022】
図5に示すように、フィンガー部1は、橋軸直角方向の相対変位に際して破壊する連結部材8により連結している。すなわち、橋軸直角(横断)方向Yの相対変位に際して所定値以上の力がかかると破壊するように設定した金属製の連結部材8によって、櫛形のフィンガー部1の一方側の指部9が基部10に対して連結している。
【0023】
この連結部材8は、遊間3の橋軸(走路)方向Xの所定値以上の大きな圧縮変位に対しても破壊して対処できるように設定している。
【0024】
なお前記連結部材8は、フィンガー部1に対して複数個を直列に連結してもよい(図示せず)。このように構成すると、直列の連結部材の数により、破壊する際の値を調節することができる。
(実施形態4)
次に、実施形態4を実施形態3との相違点を中心に説明する。
【0025】
実施形態4では図6に示すように、対向する櫛形のフィンガー部1の両側が、所定値以上の力がかかると破壊するように設定した。この連結部材8も、遊間3の橋軸(走路)方向Xの所定値以上の大きな圧縮変位に対しても破壊して対処できるように設定している。
(実施形態5)
次に、実施形態5を上記実施形態との相違点を中心に説明する。
【0026】
図7に示すように、橋軸直角方向の相対変位に際して破壊可能なノックピン11によって、櫛形のフィンガー部1の一方側の指部9が基部10に対して連結している。フィンガー部1を連結するピン11の本数や太さ、材質等により、破壊する際の値を設定することができる。
(実施形態6)
次に、実施形態6を実施形態5との相違点を中心に説明する。
【0027】
図8に示すように、対向する櫛形のフィンガー部1の両側が、所定値以上の力がかかると破壊するように設定しており、地震等に起因する橋軸直角(横断)方向Yの相対変位に対してより円滑に対処することができる。
【0028】
なおノックピン11は、落下防止部材7に対して連結してもよい。
(実施形態7)
次に、実施形態7を上記実施形態との相違点を中心に説明する。
【0029】
図9に示すように、対向するフィンガー部1の基部10をコンクリート製としており、橋軸直角(横断)方向Yの相対変位に際して基部10のコンクリートに所定値以上の力がかかると破壊するように設定している。また対向するフィンガー部1の両側が、橋軸直角(横断)方向Yの相対変位に際して破壊可能としている。なお、対向するフィンガー部1の一方側だけが橋軸直角(横断)方向Yの相対変位に際して破壊可能であるようにしてもよい。
【0030】
【発明の効果】
この発明は上述のような構成であり、次の効果を有する。
【0031】
地震などの非常時に所定値以上の力がかかるとフィンガー部が破壊して相対変位が可能となるので、地震などによる橋軸直角方向の大きな相対変位を許容できる橋梁用伸縮装置を提供することができる。
【図面の簡単な説明】
【図1】この発明の橋梁用伸縮装置の実施形態1を説明する要部平面図。
【図2】図1の橋梁用伸縮装置の要部拡大断面図。
【図3】図1の橋梁用伸縮装置の全体断面図。
【図4】この発明の橋梁用伸縮装置の実施形態2を説明するための一部破断斜視図。
【図5】この発明の橋梁用伸縮装置の実施形態3を説明する要部平面図。
【図6】この発明の橋梁用伸縮装置の実施形態4を説明するための一部破断斜視図。
【図7】この発明の橋梁用伸縮装置の実施形態5を説明する要部平面図。
【図8】この発明の橋梁用伸縮装置の実施形態6を説明するための一部破断斜視図。
【図9】この発明の橋梁用伸縮装置の実施形態7を説明するための一部破断斜視図。
【図10】従来の橋梁用伸縮装置を説明する一部破断斜視図。
【図11】従来の橋梁用伸縮装置の断面図。
【図12】従来の橋梁用伸縮装置の要部平面図。
【符号の説明】
1 フィンガー部
2 橋桁
3 遊間
7 落下防止部材
8 連結部材
11 ピン
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bridge telescopic device.
[0002]
[Prior art]
Conventionally, a bridge extension device is known.
[0003]
As shown in FIGS. 10 to 12, the bridge telescopic device 31 is arranged such that opposing comb-shaped finger portions 32 are engaged with each other across a gap 34 such as a bridge girder 33 or an abutment, Supports the wheel load. This bridge expansion and contraction device 31 has an advantage that it can absorb expansion and contraction in the bridge axis (running path) direction X of the bridge girder 33 due to a temperature change or the like.
[0004]
However, from the standpoint of vehicle travel safety, the gap in the bridge axis perpendicular (crossing) direction Y is not preferable because the tire fits into the gap and a large gap cannot be taken in this direction. There was a problem that the displacement was almost unacceptable.
[0005]
Therefore, even if a large relative displacement occurs in the direction Y perpendicular to the bridge axis (transverse) across the bridge due to an earthquake or the like, the relative displacement in this direction cannot be absorbed, and the bridge with seismic isolation design that absorbs vibrations while shaking. In some cases, the corner isolation function could not be demonstrated, which could lead to the destruction or collapse of the bridge.
[0006]
[Problems to be solved by the invention]
Therefore, the present invention is intended to provide a bridge extension / contraction device that can tolerate a large relative displacement in the direction perpendicular to the bridge axis due to an earthquake or the like.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, the present invention takes the following technical means.
(1) In the bridge extension / contraction device according to the present invention, the comb-shaped finger portions are arranged to face each other with a gap between them, support the wheel load of the traveling vehicle, and absorb the extension / contraction in the bridge axis direction due to temperature change or the like. A telescopic device for a bridge, wherein the opposing finger portions are set so as to be broken when a relative displacement in a direction perpendicular to the bridge axis occurs due to an earthquake or the like and a force of a predetermined value or more is applied.
[0008]
This expansion and contraction device for bridges is set so that the opposing fingers are destroyed when a relative displacement in the direction perpendicular to the bridge axis occurs due to an earthquake or the like and a force exceeding a predetermined value is applied. Even if a force less than a predetermined value is applied during the displacement, the finger portion is not broken, and thereby the relative displacement can be restrained to ensure smooth running of the vehicle.
[0009]
On the other hand, if a large relative displacement occurs in the direction perpendicular to the bridge axis across the bridge due to an earthquake or the like and a force of a predetermined value or more is applied, the finger portion is broken and the relative displacement becomes possible. For example, a seismically isolated bridge that absorbs vibrations while shaking can exhibit the seismic isolation function, and can prevent destruction and collapse of the bridge.
{Circle around (2)} At least one side of the opposing comb-shaped finger portions may be set to break when a force of a predetermined value or more is applied.
(3) You may form a notch in the said comb-shaped finger part. If comprised in this way, the value at the time of destroying can be set with the degree of the notch of a comb-shaped finger part. For example, a notch from the outside of the finger portion or an inner slit of the finger portion can be formed as the notch. In the case of incision, the value at the time of destruction can be set by the depth.
(4) The finger portions may be connected by a rod-like connecting member. As the rod-shaped connecting member, for example, a pin or a bolt can be used. If comprised in this way, the value at the time of destroying can be set with the number and thickness of the pin and bolt which connect a finger part.
(5) The finger portions may be connected by a connecting member having a shape and / or a material that is easily broken at the time of relative displacement in a direction perpendicular to the bridge axis.
(6) A plurality of the connecting members may be connected to the finger portions in series. If comprised in this way, the value at the time of destroying can be set with the number of serial connection members.
(7) It is good also as the fall prevention member of the broken finger part was arrange | positioned under the said finger part. If comprised in this way, when a finger part will break and torn in an emergency, it will not fall to the ground by the fall prevention member of the lower side. The finger portion is broken in a direction perpendicular to the bridge axis when a force of a predetermined value or more is applied. However, the finger portion can withstand the vertical load of the traveling vehicle and be connected without breaking.
(8) The fall prevention member of the finger portion may be able to withstand the vertical load of the traveling vehicle. With this configuration, even if the finger portion is damaged after occurrence of an emergency, at least the (emergency) vehicle can pass due to the presence of the fall prevention member that can withstand the vertical load of the traveling vehicle.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
(Embodiment 1)
As shown in FIGS. 1 to 3, the bridge telescopic device of this embodiment has comb-shaped finger portions 1 arranged to face each other across a gap 3 such as a bridge girder 2 or an abutment, and a wheel load of a traveling vehicle. And absorbs expansion and contraction in the bridge axis (runway) direction X due to temperature changes and the like. Specifically, as shown in FIG. 3, it is arranged in the gap 3 between the bridge girders 2 supported by the bridge pier 5 via the seismic isolation device 4.
[0011]
The opposing finger portions 1 are set so as to break when a relative displacement in the direction perpendicular to the bridge axis occurs due to an earthquake or the like and a force of a predetermined value or more is applied. That is, one side of the opposing finger part 1 made of steel can be broken upon relative displacement in the bridge axis perpendicular (transverse) direction Y. A notch 6 is formed from both sides in the vicinity of the base on one side of the opposing comb-shaped finger portions 1 so as to be easily broken in the bridge axis perpendicular (transverse) direction Y. In this embodiment, the notch 6 is formed in the vicinity of the root of the finger portion 1, but the breakable portion may be not the vicinity of the root of the finger portion 1 but other portions near the center portion.
[0012]
Thus, the finger portion 1 can be broken and broken at the time of relative displacement in the bridge axis perpendicular (crossing) direction Y, and the relative displacement in the bridge axis perpendicular (transverse) direction Y is absorbed. A thin rubber layer (not shown) for shock reduction may be formed around the finger portion 1.
[0013]
Moreover, the fall prevention member 7 of the broken finger part 1 is arrange | positioned under the said finger part 1, This fall prevention member 7 also has a load support function. The fall prevention member 7 of the finger part 1 is designed to withstand the vertical load of the traveling vehicle.
[0014]
Next, a usage state of the bridge extension device of this embodiment will be described.
This expansion and contraction device for bridge is set so that the opposing finger part 1 is destroyed when a relative displacement in the direction perpendicular to the bridge axis occurs due to an earthquake or the like and a force exceeding a predetermined value is applied. Even if a force less than a predetermined value is applied to the relative displacement, the finger portion 1 is not broken, and thereby the relative displacement is restrained to ensure smooth running of the vehicle.
[0015]
On the other hand, if a large relative displacement occurs in the bridge axis perpendicular (crossing) direction Y across the gap 3 between the bridges due to an earthquake or the like and a force exceeding a predetermined value is applied, the notch 6 portion of the finger portion 1 breaks and the relative displacement occurs. It is possible to tolerate large relative displacement in the direction perpendicular to the bridge axis due to earthquakes. Therefore, the seismic isolation function is exhibited in the seismic isolation design bridge that includes the seismic isolation device 4 and absorbs the vibration while shaking, thereby preventing the bridge from being destroyed or collapsed.
[0016]
In other words, the bridge expansion and contraction device intentionally forms a portion that is easily broken when a force greater than a set value is applied, and breaks the finger portion so as to selectively break down to cope with relative displacement. On the other hand, since it is difficult to break in normal times, the finger portion is not broken except in an emergency such as an earthquake more than assumed, and the relative displacement can be effectively restrained.
[0017]
Moreover, it can be broken by the notch 6 near the root of the comb-shaped finger portion 1 and can be implemented as a simple structure. The value at the time of breaking can be set by the depth of the cut 6. Further, by limiting the places to be destroyed, when repairing, it is sufficient to prepare and replace the finger plate with the cuts 6 and repair is easy.
[0018]
When the finger portion 1 is broken and torn in an emergency, the fall prevention member 7 is broken down to the ground by the lower fall prevention member 7. do not do.
[0019]
The fall prevention member 7 of the finger portion is designed to withstand the vertical load of the traveling vehicle. Even if the finger portion 1 is damaged after an emergency occurs, at least the (emergency) vehicle can pass, It will not be an obstacle.
[0020]
The finger portion 1 breaks in a direction perpendicular to the bridge axis when a force of a predetermined value or more is applied, but may be formed so as to endure the vertical load of the traveling vehicle and connect without breaking.
(Embodiment 2)
Next, the second embodiment will be described focusing on the differences from the first embodiment.
[0021]
In the first embodiment, one side of the opposing comb-shaped finger portion 1 is set to break when a force of a predetermined value or more is applied, whereas as shown in FIG. 4, both sides of the opposing comb-shaped finger portion 1 are predetermined. It was set so that it would break if a force higher than the value was applied. Therefore, it is possible to more smoothly cope with the relative displacement in the bridge axis perpendicular (crossing) direction Y caused by an earthquake or the like.
(Embodiment 3)
Next, the third embodiment will be described focusing on differences from the first embodiment.
[0022]
As shown in FIG. 5, the finger portions 1 are connected by a connecting member 8 that is broken upon relative displacement in a direction perpendicular to the bridge axis. That is, the finger part 9 on one side of the comb-shaped finger part 1 is made to be a base part by a metallic connecting member 8 set so as to be broken when a force of a predetermined value or more is applied upon relative displacement in the bridge axis perpendicular (transverse) direction Y. Linked to 10.
[0023]
The connecting member 8 is set so as to be able to break and deal with a large compression displacement of a predetermined value or more in the bridge axis (running path) direction X of the gap 3.
[0024]
A plurality of the connecting members 8 may be connected in series to the finger portion 1 (not shown). If comprised in this way, the value at the time of destruction can be adjusted with the number of serial connection members.
(Embodiment 4)
Next, the fourth embodiment will be described focusing on differences from the third embodiment.
[0025]
In the fourth embodiment, as shown in FIG. 6, both sides of the opposing comb-shaped finger portions 1 are set to be broken when a force of a predetermined value or more is applied. The connecting member 8 is also set so as to be able to break and deal with a large compression displacement of a predetermined value or more in the bridge axis (running path) direction X of the gap 3.
(Embodiment 5)
Next, the fifth embodiment will be described focusing on the differences from the above embodiment.
[0026]
As shown in FIG. 7, the finger portion 9 on one side of the comb-shaped finger portion 1 is connected to the base portion 10 by a knock pin 11 that can be broken upon relative displacement in a direction perpendicular to the bridge axis. The value at the time of destruction can be set by the number, thickness, material and the like of the pins 11 connecting the finger portions 1.
(Embodiment 6)
Next, the sixth embodiment will be described focusing on the differences from the fifth embodiment.
[0027]
As shown in FIG. 8, both sides of the opposing comb-shaped finger portions 1 are set so as to be broken when a force exceeding a predetermined value is applied, and relative to the bridge axis perpendicular (crossing) direction Y caused by an earthquake or the like. The displacement can be dealt with more smoothly.
[0028]
The knock pin 11 may be connected to the fall prevention member 7.
(Embodiment 7)
Next, the seventh embodiment will be described focusing on the differences from the above embodiment.
[0029]
As shown in FIG. 9, the base portion 10 of the opposing finger portion 1 is made of concrete so that when a force of a predetermined value or more is applied to the concrete of the base portion 10 in the relative displacement in the bridge axis perpendicular (transverse) direction Y, the base portion 10 is destroyed. It is set. Further, both sides of the opposing finger portions 1 can be broken upon relative displacement in the direction Y perpendicular to the bridge axis (transverse). Note that only one side of the opposing finger portions 1 may be capable of being broken upon relative displacement in the bridge axis perpendicular (transverse) direction Y.
[0030]
【The invention's effect】
The present invention is configured as described above and has the following effects.
[0031]
To provide a bridge expansion and contraction device that can tolerate a large relative displacement in the direction perpendicular to the bridge axis due to an earthquake, etc., when a force of a predetermined value or more is applied in an emergency such as an earthquake, and the finger portion breaks and relative displacement is possible. it can.
[Brief description of the drawings]
FIG. 1 is a plan view of a principal part for explaining Embodiment 1 of a bridge extension / contraction device according to the present invention;
FIG. 2 is an enlarged cross-sectional view of a main part of the bridge expansion and contraction device in FIG. 1;
3 is an overall cross-sectional view of the bridge expansion and contraction device in FIG. 1;
FIG. 4 is a partially broken perspective view for explaining a second embodiment of the bridge telescopic device of the present invention.
FIG. 5 is a plan view of an essential part for explaining Embodiment 3 of the bridge extension / contraction device of the present invention;
FIG. 6 is a partially broken perspective view for explaining a fourth embodiment of the bridge extension / contraction device according to the present invention.
FIG. 7 is a plan view of a principal part for explaining a fifth embodiment of a bridge extension / contraction device according to the present invention;
FIG. 8 is a partially broken perspective view for explaining a sixth embodiment of the bridge expansion and contraction device of the present invention.
FIG. 9 is a partially broken perspective view for explaining a seventh embodiment of the bridge telescopic device of the present invention.
FIG. 10 is a partially broken perspective view for explaining a conventional bridge telescopic device.
FIG. 11 is a cross-sectional view of a conventional bridge extension / contraction device.
FIG. 12 is a plan view of an essential part of a conventional bridge extension / contraction device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Finger part 2 Bridge girder 3 Spacing 7 Fall prevention member 8 Connection member
11 pin

Claims (8)

櫛形のフィンガー部が遊間をはさんで対向して配設され、走行車両の輪荷重を支持し、温度変化等による橋軸方向の伸縮を吸収する橋梁用伸縮装置であって、前記対向するフィンガー部は地震等で橋軸直角方向の相対変位が生じて所定値以上の力がかかると破壊するように設定されたことを特徴とする橋梁用伸縮装置。An extension device for a bridge in which comb-shaped fingers are arranged to face each other across a gap, support a wheel load of a traveling vehicle, and absorb expansion and contraction in a bridge axis direction due to a temperature change or the like. The bridge expansion and contraction device is characterized in that the portion is set to be destroyed when a relative displacement in the direction perpendicular to the bridge axis occurs due to an earthquake or the like and a force exceeding a predetermined value is applied. 前記対向する櫛形のフィンガー部の少なくとも一方側が所定値以上の力がかかると破壊するように設定された請求項1記載の橋梁用伸縮装置。The expansion / contraction device for a bridge according to claim 1, wherein at least one side of the opposing comb-shaped finger portions is set to be broken when a force of a predetermined value or more is applied. 前記櫛形のフィンガー部に切欠が形成された請求項1又は2記載の橋梁用伸縮装置。The expansion and contraction device for a bridge according to claim 1 or 2, wherein a notch is formed in the comb-shaped finger portion. 前記フィンガー部が棒状接続部材により連結されている請求項1乃至3のいずれかに記載の橋梁用伸縮装置。The expansion-contraction apparatus for bridges in any one of Claims 1 thru | or 3 with which the said finger part is connected by the rod-shaped connection member. 前記フィンガー部が橋軸直角方向の相対変位に際して破壊しやすい形状又は/及び材質の連結部材により連結されている請求項1乃至4のいずれかに記載の橋梁用伸縮装置。The expansion / contraction device for a bridge according to any one of claims 1 to 4, wherein the finger portions are connected by a connection member having a shape and / or a material that is easily broken at the time of relative displacement in a direction perpendicular to the bridge axis. 前記連結部材はフィンガー部に対して複数個が直列に連結されている請求項5記載の橋梁用伸縮装置。The bridge expansion and contraction device according to claim 5, wherein a plurality of the connection members are connected in series to the finger portions. 前記フィンガー部の下側に破壊したフィンガー部の落下防止部材が配設された請求項1乃至6のいずれかに記載の橋梁用伸縮装置。The expansion / contraction device for a bridge according to any one of claims 1 to 6, wherein a fall prevention member for the broken finger part is disposed below the finger part. フィンガー部の落下防止部材は走行車両の鉛直荷重に耐えられるようにした請求項1乃至7のいずれかに記載の橋梁用伸縮装置。The expansion / contraction device for a bridge according to any one of claims 1 to 7, wherein the fall prevention member of the finger portion can withstand a vertical load of the traveling vehicle.
JP31009698A 1998-10-30 1998-10-30 Telescopic device for bridge Expired - Fee Related JP3639944B2 (en)

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